Lamp-chimney



(No Model.)

' J. RADDIN.

LAMP CHIMNEY.

INVENTUR. SM {Rudd/Ma). f mnkwmkhwg.

ATTJJRNEY.

n. PETERS, PhnhvLllhogmphnr, Washington. a. c.

UNITED STATES PATENT OEEIcE.

JOHN RADDIN, OF LYNN, MASSACHUSETTS.

LAMP-CHIMNEY.

SPECIFICATION forming part of Letters Patent No. 393,855, dated December4, 1888.

Application filed February 27, 1888- Serial No. 265,511. (No model.)

T0 to whom it may concern.-

Be it known that 1, JOHN RADDIN, of Lynn, in the county of Essex andState of M assachusetts, have invented certain new and usefulImprovements in Lamp-Chimneys, of which the following, taken inconnection with the accompanying drawings, is a specification.

My invention relates to chimneysdesigned for use upon lamps.

It has for its object the production of safe, eflicient, and convenientchimneys.

Figure 1 represents, in front elevation, my invention as applied to thecommon Sun Burner. Fig. 2 represents chimney and burner, as illustratedby Fig. 1, as having been turned to the left about its vertical axisone-eighth of a turn, or forty-ii ve degrees. Fig. 3 is a sectional viewof the chimney on section-lines 44 and 5 5 of Figsl and2,respectively,looking down.

The burner 6, represented by full and dotted lines in Figs. 1. and 2, isone of the most common style used. It is sold as the Sun Burner, styleA. The burner being so, well known, a brief description will be found tobe sufficient. It is provided with the base-plate 7, against which it isdesirable that the lower edge of the chimney should be held in closecontact, in order to prevent the flickering of the light which may becaused whenever any air enters the chimney by means of other openingsthan are provided in the usual manner. The burner is also provided withthe usual spring-chimney claims, 8, of the usual form and number.

The chimney 9, of glass, is provided at its lower portion with a numberof elongated outwardly-curved locking-cheeks, 10, equal in number to thenumber of spring-clamps. It is also provided at its lower port-ion witha number of straight or nearly straight guideways, 11, in number (four)equal to the number of curved cheeks. In other respects the chimney isof a common form.

I11 the pushing of the chimney into its position'upon the burner thechimney is held so that its straight or nearly straight guideways 11 arepresented to the slight resistance offered by the spring-clamps. Thenthe chimney is given a one-eighth turn about its vertical axis, and thechimney is then firmly held by the spring-clamps, as represented by Fig.

2, and resting against the elongated curved cheeks.

The outer curve of the curved cheeks of the chimney and the-inner curveof the springclamps are made, as represented by Fig. 2, so that thespring tension of the spring-clamps is such as will tend not only tohold the chimney securely in its position, but will exert a forcedownward upon the chimney, the'effect of which is to keep the lower edgeof the chimney always in close contact with the base plate, therebypreventing injurious air-currents inside the chimney, which would causethe flame to flicker and become unsteady.

The straight or nearly straight guideways may have a slight curve, ifdesired, the result sought to be obtained in the shape of these portionsbeing to make them of such a form as will present only the slightresistance desired to the forcing of the chimney into its position uponthe burner.

The curved cheeks are of a curve sufficient to prevent the tipping ofthe chimney from off the burner, unless a force be used greater than theburn er shown will bear. By experiment it has been proved that a forcemay be applied to remove a chimney made as represented from its burnervertically sufficient to tear the burner apart without drawing thechimney from its position.

A chimney made represented may eX- pand and contract without breakage.

It is obvious that my chimney presents many advantages, such as lowcost, adaptability to burners now in use, non-liability to injuriouseffects of expansion and contraction, prevention .of unsteady flame dueto injurious air-currents, and perfect safety.

Chimneys for many purposes, and for streetcar lamps and the like, ifdesired, may have vertical recesses, as 12, made in the curved cheeks,as represented by dotted lines, Fig. 3, of a width sufficient to receivethe spring clamps and of a depth such as will present resistance to anyrotary movement of the chimney.

It is evident that the number of curved cheeks should be equal to thenumber of spring-clamps, which may be (at pleasure) four, more or less.

What I claim as new, and desire to secure by Letters Patent, is

1. A lamp-ehimnev provided at its lower end with straight orapproximately straight exterior longitudinal guidewavs and between 4.The eomhination ot' a lamp-burner the l'iase-plate ot' whieh is providedwith a numher of upwardlv-projeeting inwardly-eurved said guit'lewa vswith outwardlv-fiaring elon- 5 periphery, and a lamp-ehimnev fittingover gated loek in g-eheeks.

2. The eombination of a lamp-burner the base-plate ot' whieh is providedwith a num- 3 her of upwardly-projeeting imvardlv-eurved spring-elampsdisposed at intervals around its periphery, and a lamp-ehimney fittingover said base-plate and provided at intervals with straighterapproximately straight longitudinal guideways for the passage of saidspringelainps in adjustingor removing the chimney and between saidguideways with elongated outwardly-curved locking-cheeks the curvatureof which corresponds approximately with the inward curvature of theclamps.

3. A lamp-ehimne v provided at its lower end with straight orapproximately straight exterior longitudinal guideuavs andhetween saidguidewavs with outwvardlv-flaring elongated loeking-eheeks, said eheekshaving vertical recesses.

spring'elamps disposed at intervals around its said base-plate andprovided at intervals with straight or approximately straightlongitudinal guideways tor the passage of said springelamps inadjustingor removing the chimney and between said guideways withelongated outwardly-enrved locking-cheeks the enrva ture of whieheorresponds approximately with the inward curvature of the clamps, saidcheeks having vertieal reeesses in whieh said elamps may rest.

In testimony whereof I have signed 11])11211110 to this speeitieation,in the presence of two suhserihing witnesses, on this 21st day ofFebruar v, A. l). 1888.

.l )l l N RAD DIN.

Witnesses:

E. FRANK. \VUODBURY, J. L. BAILEY.

